376 MR. J. N. HALBEET : NOTES ON ACARI, 
the Irish specimen (length 342 /i, breadth 220 j«.), there are two plain spines 
(fig. 16), the outer one being a little longer than the other. It is possible, 
however, that the specimen may be immature. Canestrini remarks : " le quali 
portano all' apice, nelle forme giovani, ciascuna due setole, nelle piu avonzate 
di eta ciascuna una setola robusta diretta in dietro e in dentro" (20). 
Locality. One female found under a stone on the Malahide sandhills in 
August. 
FOLYASPINUS CYLINDRICUS, Berl. (PI. 21. fig. 17.) 
1916. Berleae, 11, p. 134.— 1917. Berlese, 16, p. 10. 
This interesting genus was founded to receive the present species, and 
belongs to the tribe Polyaspidini of Berlese's recent classification of the family 
Uropodidse (16). The Species may be recognized by the elongate sub- 
parallel shape ; the central area of the dorsum is protected by a long, narrow 
shield, smooth at the centre, roughened at the sides ; at the end of this are 
three small shields, of which the middle one is the least, arranged in a trans- 
verse row. The marginal shields are represented by a row of small hair- 
bearing plates, and on the actual body margin are numerous similar plates. 
The venter is protected by strongly-chitinized and fused plates ; their margins 
are indicated by thickened ridges. Peritreme placed on the side margins of 
the body. Hairs simple and blade-shaped. Legs robust, claws of the first 
pair much reduced. Length about 670 yu-, breadth 300 /a. The male is 
unknown. Identification verified by Dr. Berlese. 
Locality. Several females found under logs of wood half buried in the 
mossy banks of the stream between Glendalough and Laragb, in April. 
Trachytes ptriformis {Kramer). 
1876. Trachynotus pyriformis, Kramer, 28, p. 80. — 1877. Cauestriui et Fanzago, 21, 
p. 68. — 1882. Kramer, 30, p. 420. — 1892. Trachynotus cegrota var. pyriformis, 
Berlese,! (Mesostig-. Siipp. p. 94).— 1894. Michael, 33, p. 313.— 1915. Berlese, 9, 
. p. 134. 
The above are the principal records undoubtedly referring to Kramer's 
species, which was described in 1876. There has been confusion between 
this species and the form described as T. cegrota hj Koch, ,and if the latter 
were clearly recognizable it would be the type of the genus Trachytes. 
There is doubt, however, concerning the identity of Koch's T. cegrota; a 
species supposed to be the same was described and figured by Dr. Berlese (1, 
Fasc. xxxviii. n. 10), but he has since suppressed this, stating that it may 
have been identical with either of his two recently described species, 
T. lambda or T. tubifer (9, p. 13.5). It would then follow that T. pyriformis, 
Kramer, is the type of the genus Trachytes. Fortunately this species was 
carefully described and figured by Kramer (28). Mr. A. D. Michael has 
recorded both 2\ wgrota, Koch, and T. pyriformis, Kramer, from English 
localities, but he did not describe the first-mentioned form. 
